mirror of
https://github.com/containers/podman.git
synced 2025-07-18 10:08:07 +08:00
280f5d8cb0
implement new ssh interface into podman this completely redesigns the entire functionality of podman image scp, podman system connection add, and podman --remote. All references to golang.org/x/crypto/ssh have been moved to common as have native ssh/scp execs and the new usage of the sftp package. this PR adds a global flag, --ssh to podman which has two valid inputs `golang` and `native` where golang is the default. Users should not notice any difference in their everyday workflows if they continue using the golang option. UNLESS they have been using an improperly verified ssh key, this will now fail. This is because podman was incorrectly using the ssh callback method to IGNORE the ssh known hosts file which is very insecure and golang tells you not yo use this in production. The native paths allows for immense flexibility, with a new containers.conf field `SSH_CONFIG` that specifies a specific ssh config file to be used in all operations. Else the users ~/.ssh/config file will be used. podman --remote currently only uses the golang path, given its deep interconnection with dialing multiple clients and urls. My goal after this PR is to go back and abstract the idea of podman --remote from golang's dialed clients, as it should not be so intrinsically connected. Overall, this is a v1 of a long process of offering native ssh, and one that covers some good ground with podman system connection add and podman image scp. Signed-off-by: Charlie Doern <cdoern@redhat.com>
104 lines
2.3 KiB
Go
104 lines
2.3 KiB
Go
package sftp
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import (
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"os"
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"syscall"
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)
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var EBADF = syscall.NewError("fd out of range or not open")
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func wrapPathError(filepath string, err error) error {
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if errno, ok := err.(syscall.ErrorString); ok {
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return &os.PathError{Path: filepath, Err: errno}
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}
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return err
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}
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// translateErrno translates a syscall error number to a SFTP error code.
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func translateErrno(errno syscall.ErrorString) uint32 {
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switch errno {
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case "":
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return sshFxOk
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case syscall.ENOENT:
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return sshFxNoSuchFile
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case syscall.EPERM:
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return sshFxPermissionDenied
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}
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return sshFxFailure
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}
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func translateSyscallError(err error) (uint32, bool) {
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switch e := err.(type) {
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case syscall.ErrorString:
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return translateErrno(e), true
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case *os.PathError:
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debug("statusFromError,pathError: error is %T %#v", e.Err, e.Err)
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if errno, ok := e.Err.(syscall.ErrorString); ok {
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return translateErrno(errno), true
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}
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}
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return 0, false
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}
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// isRegular returns true if the mode describes a regular file.
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func isRegular(mode uint32) bool {
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return mode&S_IFMT == syscall.S_IFREG
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}
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// toFileMode converts sftp filemode bits to the os.FileMode specification
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func toFileMode(mode uint32) os.FileMode {
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var fm = os.FileMode(mode & 0777)
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switch mode & S_IFMT {
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case syscall.S_IFBLK:
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fm |= os.ModeDevice
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case syscall.S_IFCHR:
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fm |= os.ModeDevice | os.ModeCharDevice
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case syscall.S_IFDIR:
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fm |= os.ModeDir
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case syscall.S_IFIFO:
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fm |= os.ModeNamedPipe
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case syscall.S_IFLNK:
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fm |= os.ModeSymlink
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case syscall.S_IFREG:
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// nothing to do
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case syscall.S_IFSOCK:
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fm |= os.ModeSocket
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}
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return fm
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}
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// fromFileMode converts from the os.FileMode specification to sftp filemode bits
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func fromFileMode(mode os.FileMode) uint32 {
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ret := uint32(mode & os.ModePerm)
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switch mode & os.ModeType {
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case os.ModeDevice | os.ModeCharDevice:
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ret |= syscall.S_IFCHR
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case os.ModeDevice:
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ret |= syscall.S_IFBLK
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case os.ModeDir:
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ret |= syscall.S_IFDIR
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case os.ModeNamedPipe:
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ret |= syscall.S_IFIFO
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case os.ModeSymlink:
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ret |= syscall.S_IFLNK
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case 0:
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ret |= syscall.S_IFREG
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case os.ModeSocket:
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ret |= syscall.S_IFSOCK
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}
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return ret
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}
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// Plan 9 doesn't have setuid, setgid or sticky, but a Plan 9 client should
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// be able to send these bits to a POSIX server.
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const (
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s_ISUID = 04000
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s_ISGID = 02000
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s_ISVTX = 01000
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)
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